Distribution of Arc positive cells along segments of the spinal cord.

<p>Number of Arc positive cells relative to spinal cord segmental location. Vertical segmented line represents the position between the L3 and L4 segments with the highest number of Arc positive cells. Data points represent means ± SEM of four consecutive sections (400μm) from each of three rats (N = 3 animals). The control graph shows the average number of cells in control, unstimulated rats (N = 3).